* {
    margin: 0;
}

#app {
    width: 400px;
    height: 500px;
    left: 50%;
    top: 50%;
    position: absolute;
    margin-left: -200px;
    margin-top: -250px;
    background-color: aqua;
    border-radius: 10px;
}

.header {
    text-align: center;
    font-weight: 900;
    font-size: 35px;
    margin: 20px 0;
}

fieldset {
    width: 200px;
    height: 100px;
    text-align: center;
    position: relative;
    left: 50%;
    margin-left: -115px;
}

button {
    position: relative;
    width: 200px;
    height: 70px;
    margin: 50px 0 50px -100px;
    left: 50%;
}

button:hover {
    cursor: pointer;
}

select:hover {
    cursor: pointer;
}